Astm A105N China Stainless Steel Flange Slip On Flange Dn50 Flange

Astm A105N China Stainless Steel Flange Slip On Flange Dn50 Flange

Forged Slip-On Flange (DN50 / 2-Inch Nominal Sizing)

Category: Flanges | Sub-Category: Slip-On Flange / Hubbed Plate Family

Core Features

  • DN50 / 2-Inch Nominal Standard Sizing: Precision-machined with a center clearance internal bore engineered to slide seamlessly over standard 2-inch nominal outer diameter (60.3 mm) piping networks, distribution headers, or pump discharge lines.
  • Premium Metallurgical Integrity: * Carbon Steel Variant (ASTM A105N): Hot-forged and subjected to a strict post-forging normalization heat treatment. This thermal phase refines the internal grain matrix, eliminates structural cooling stresses, and significantly enhances low-temperature impact toughness.
    • Stainless Steel Variant (ASTM A182): Hot-forged from premium F304L or F316L austenitic stainless steel, providing outstanding defense against chloride pitting, chemical oxidation, and systemic fluid rust.
  • Low-Profile Slip-On (SO) Hub Profile: Features a low-profile raised hub or collar surrounding the center bore. This architecture distributes mechanical and thermal pipeline stresses far more effectively than a standard hubless plate ring, making it highly resilient under localized system vibrations.
  • Double Fillet Weld Joint Security: Attached to the pipeline by sliding directly over the outer diameter of the DN50 pipe and securing via both an external fillet weld around the hub neck and an internal fillet weld along the inside bore face, creating a high-integrity, leak-proof mechanical joint.
  • Precision CNC Sealing Face: The mating face (typically Raised Face – RF) is precision-turned on multi-axis CNC lathes to achieve parallel joint alignment. Finished with standardized micro-grooved phonographic or concentric serrations ( finish) to ensure maximum gasket mechanical friction and prevent fluid blowout under pressure surges.

At Kriloha Gaskets & Hardware, we recognize that mid-bore process networks require components that seamlessly balance robust mechanical security with standardized line flexibility. Our DN50 (2-Inch) Forged Slip-On (SO) Flanges represent our engineered answer for “High-Load-Joint-Security” and “Zero-Flexing-Integrity” across essential processing arrays. Sourced from our advanced automated fabrication facilities, Kriloha bridges the gap between raw material science and precise international dimensional standards, ensuring that every slip-on component integrates flawlessly alongside your high-performance sealing gaskets.

The engineering of our DN50 slip-on program is founded on Microstructural Uniformity and Deflection-Resistant Flatness. By forcing certified steel stock through controlled hot-forging paths rather than relying on lower-cost casting alternatives, we completely eliminate internal gas pockets, casting porosities, and structural micro-cracks. When choosing our ASTM A105N Carbon Steel program, the normalization heat treatment ensures uniform hardness and exceptional mechanical toughness under cyclical line stress. Alternatively, our ASTM A182 Stainless Steel program features low-carbon “L-Grade” thresholds to prevent intergranular corrosion cracking along the weld line. At Kriloha, we precision-machine the sealing surfaces on advanced CNC turning centers, finishing them with controlled phonographic serrations ( finish) that firmly anchor the gasket matrix to eliminate fluid bypass or blowout risks during sudden system pressure cycles.

Manufacturing and provisioning these critical flow-control connection pieces involves strict Dimensional Tolerance Checks, Volumetric Material Inspections, and Face Roughness Calibration. We collaborate directly with your project engineering, procurement, and facility maintenance teams to supply precise internal bores tailored to standard pipe outer diameters and unique wall-thickness schedules (such as Schedule 40 or Schedule 80 matching). By choosing Kriloha Gaskets & Hardware, you are investing in a “Future-Proof” industrial partnership that prioritizes your system’s lifetime reliability through superior metallurgy and micro-tolerance engineering.

Primary Industrial Applications

  • Moderate-Pressure Plant Utilities: Ideal for main factory utility headers distributing industrial cooling water, low-pressure steam, compressed air loop arrays, cooling tower circuits, and inert gas pipelines operating under Class 150 or PN16 parameters.
  • Midstream Hydrocarbon Lines (Carbon Steel): Economical, heavy-duty connection joints for crude oil transport manifolds, storage terminal trunk lines, and fuel oil distribution networks where fluid corrosion risks are minimal.
  • Hygienic & Corrosive Processing (Stainless Steel): Clean-utility networks in food processing, beverage bottling, pharmaceuticals, and chemical dosing manifolds where non-porous stainless surfaces prevent contamination.
  • Municipal Water & Wastewater Distribution: Standard space-saving connection joints for large-scale water treatment headers, municipal sewage drainage networks, and high-volume pump station manifolds.
  • Modular Industrial Process Skids: Compact structural mounting flanges used to securely link prefabricated piping manifolds directly to raised-face valves, strainers, instrumentation blocks, and storage vessels.

💡 Engineering Note

There is a minor material contradiction in this product string. ASTM A105N explicitly designates normalized carbon steel engineered for ambient- and higher-temperature piping systems. If your project strictly requires stainless steel while maintaining this identical DN50 dimensional layout, the correct metallurgical specification is ASTM A182 (such as Grade F304L or F316L).

At Kriloha Gaskets & Hardware, we manufacture and supply this DN50 configuration in either material stream based on your pipeline’s exact environmental demands: Normalized Carbon Steel (A105N) for robust utility toughness or Austenitic Stainless Steel (A182) for severe chemical and rust protection. Below are the unified features of both premium variants built to this standard blueprint.

Frequently Asked Questions (FAQs)

Is ASTM A105N a carbon steel or stainless steel specification?

ASTM A105N is strictly a forged carbon steel material specification meant for ambient- and higher-temperature piping service. The “N” signifies that the steel has been normalized (heat-treated) to improve its impact toughness. If your pipeline explicitly requires stainless steel, the correct material standard to specify is ASTM A182 (such as Grade F304L or F316L).

What is the structural difference between a Slip-On (SO) flange and a standard Flat Plate flange?

While both types slide over the pipe outer diameter and utilize double fillet welding, a standard plate flange is completely flat and collarless. A Slip-On flange features a low-profile raised hub or collar surrounding the center bore. This hub provides additional structural reinforcement at the weld zone, helping to distribute pipeline stresses and making it better suited for slightly higher mechanical loads or vibration profiles.

What specific welding configuration is required to install a DN50 Slip-On flange?

A slip-on flange requires a standard double fillet weld setup for proper code-compliant installation:

One robust fillet weld around the exterior where the hub neck meets the outer diameter of the pipe wall.

A secondary fillet weld inside the bore, where the pipe end is slid back slightly (typically equal to the pipe wall thickness plus 3mm) from the flange face to prevent heat or weld spatter from damaging the machined sealing surface.

Can a carbon steel Raised Face (RF) flange be safely bolted to a Flat Face (FF) Cast Iron valve?

It is highly recommended not to mate a Raised Face steel flange directly to a Flat Face cast iron component. Because cast iron is brittle, the concentrated clamping force generated by the raised face inside the bolt circle creates a bending moment that can crack or fracture the expensive cast iron valve body when torque is applied. Like-to-like face configurations are best engineering practice.

Are Material Test Reports (MTRs) provided with these forged DN50 flanges from Kriloha?

At Kriloha Ltd., quality assurance is completely non-negotiable. Every shipment from our facility can be accompanied by comprehensive Material Test Reports (MTRs) confirming exact chemical compositions, thermal heat treatment history (such as Normalizing parameters), hardness values, yield/tensile strength data, and explicit compliance with international industrial standards (such as ASME B16.5 or EN 1092-1 layouts) to guarantee complete code traceability.

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